<template>
	<div :class="{ 'show': show }" class="header-search">
		<svg-icon class-name="search-icon" icon-class="search" @click.stop="click" />
		<el-select ref="headerSearchSelect" v-model="search" :remote-method="querySearch" filterable default-first-option
			remote :placeholder="$t('placeholderTip.searchMenu')" class="header-search-select" @change="change">
			<el-option v-for="item in options" :key="item.path" :value="item" :label="item.title.join(' > ')" />
		</el-select>
	</div>
</template>

<script>
// fuse is a lightweight fuzzy-search module
// make search results more in line with expectations
import Fuse from 'fuse.js'
import path from 'path'

export default {
	name: 'HeaderSearch',
	data() {
		return {
			search: '',
			options: [],
			searchPool: [],
			show: false,
			fuse: undefined
		}
	},
	computed: {
		routes() {
			return this.$store.getters.permission_routes
		},
	},
	watch: {
		routes() {
			this.searchPool = this.generateRoutes(this.routes)
		},
		searchPool(list) {
			this.initFuse(list)
		},
		show(value) {
			if (value) {
				document.body.addEventListener('click', this.close)
			} else {
				document.body.removeEventListener('click', this.close)
			}
		}
	},
	mounted() {
		this.searchPool = this.generateRoutes(this.routes)
	},
	methods: {
		onRefresh() {
			this.searchPool = this.generateRoutes(this.routes)
		},
		click() {
			this.show = !this.show
			if (this.show) {
				this.$refs.headerSearchSelect && this.$refs.headerSearchSelect.focus()
			}
		},
		close() {
			this.$refs.headerSearchSelect && this.$refs.headerSearchSelect.blur()
			this.options = []
			this.show = false
		},
		change(val) {
			this.$router.push(val.path)
			this.search = ''
			this.options = []
			this.$nextTick(() => {
				this.show = false
			})
		},
		initFuse(list) {
			this.fuse = new Fuse(list, {
				shouldSort: true,
				threshold: 0.4,
				location: 0,
				distance: 100,
				maxPatternLength: 32,
				minMatchCharLength: 1,
				keys: [{
					name: 'title',
					weight: 0.7
				}, {
					name: 'path',
					weight: 0.3
				}]
			})
		},
		// Filter out the routes that can be displayed in the sidebar
		// And generate the internationalized title
		generateRoutes(routes, basePath = '/', prefixTitle = []) {
			let res = []

			for (const router of routes) {
				// skip hidden router
				if (router.hidden) { continue }

				const data = {
					path: path.resolve(basePath, router.path),
					title: [...prefixTitle]
				}
				if (router.meta && router.meta.title) {
					// 处理多语言title
					var name = ''
					router.meta.title.map(i => {
						if (this.$store.getters.languageId === i.langId) {
							name = i.name
						}
					})
					data.title = [...data.title, name]
					if (router.redirect !== 'noRedirect') {
						// only push the routes with title
						// special case: need to exclude parent router without redirect
						res.push(data)
					}
				}

				// recursive child routes
				if (router.children) {
					const tempRoutes = this.generateRoutes(router.children, data.path, data.title)
					if (tempRoutes.length >= 1) {
						res = [...res, ...tempRoutes]
					}
				}
			}
			return res
		},
		querySearch(query) {
			if (query !== '') {
				this.options = this.fuse.search(query)
			} else {
				this.options = []
			}
		}
	}
}
</script>

<style lang="scss" scoped>
.header-search {
	font-size: 0 !important;

	.search-icon {
		cursor: pointer;
		font-size: 18px;
		vertical-align: middle;
	}

	.header-search-select {
		font-size: 18px;
		transition: width 0.2s;
		width: 0;
		overflow: hidden;
		background: transparent;
		border-radius: 0;
		display: inline-block;
		vertical-align: middle;

		::v-deep .el-input__inner {
			border-radius: 0;
			border: 0;
			padding-left: 0;
			padding-right: 0;
			box-shadow: none !important;
			border-bottom: 1px solid #d9d9d9;
			vertical-align: middle;
		}
	}

	&.show {
		.header-search-select {
			width: 210px;
			margin-left: 10px;
		}
	}
}
</style>
